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\begin{document}



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% Text Node
\draw (129,392.5) node   {$x$};
% Text Node
\draw (131.5,409) node  [align=left] {(a) 线性回归};
% Text Node
\draw (492.5,409) node  [align=left] {(b) Logistic 回归};


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\end{document}
